package com.concurrent.chapter2.concurrent03;

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class CyclicBarrierTest {
	public static void main(String[] args) {
		ExecutorService service = Executors.newCachedThreadPool();
		final CyclicBarrier cb = new CyclicBarrier(3);//创建CyclicBarrier对象并设置3个公共屏障点
		for (int i = 0; i < 3; i++) {
			Runnable runnable = new Runnable() {
				
				@Override
				public void run() {
					try {
						Thread.sleep((long)(Math.random()*10000));
						System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点1，当前已有" + cb.getNumberWaiting() + "个已经到达，正在等候");   
						cb.await();//到此如果没有达到公共屏障点，则该线程处于等待状态，如果达到公共屏障点则所有处于等待的线程都继续往下运行
						Thread.sleep((long)(Math.random()*10000));
						System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点2，当前已有" + cb.getNumberWaiting() + "个已经到达，正在等候");   
						cb.await();
						Thread.sleep((long)(Math.random()*10000));
						System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点3，当前已有" + cb.getNumberWaiting() + "个已经到达，正在等候");   
						cb.await();
					} catch (InterruptedException | BrokenBarrierException e) {
						e.printStackTrace();
					}  
				}
			};
			service.execute(runnable);
		}
		service.shutdown();
	}
}
